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Chimpanzee lip-smacking facilitates cooperative behaviour.

Fedurek P, Slocombe KE, Hartel JA, Zuberbühler K - Sci Rep (2015)

Bottom Line: We found that lip-smacking, a distinct multimodal oral gesture produced during grooming, coordinated this activity.Lip-smacking at the beginning of grooming bouts was significantly more often followed by longer and reciprocated bouts than silent grooming initiations.Data are consistent with the hypothesis that chimpanzee lip-smacks function to coordinate and prolong social grooming, suggesting that this oral signal is an example of a communicative behaviour facilitating cooperative behaviour in chimpanzees.

View Article: PubMed Central - PubMed

Affiliation: Institute of Biology, University of Neuchâtel, Switzerland.

ABSTRACT
Signalling plays an important role in facilitating and maintaining affiliative or cooperative interactions in social animals. Social grooming in primates is an example of an interaction that requires coordination between partners but little is known about communicative behaviours facilitating this activity. In this study, we analysed the communication of wild chimpanzees of Budongo Forest, Uganda, as they entered and maintained a naturally occurring cooperative interaction: social grooming. We found that lip-smacking, a distinct multimodal oral gesture produced during grooming, coordinated this activity. Lip-smacking at the beginning of grooming bouts was significantly more often followed by longer and reciprocated bouts than silent grooming initiations. Lip-smacks were more likely to be produced when the risk of termination of the interaction by the recipient was high, for instance when grooming vulnerable body parts. Groomers were also more likely to produce lip-smacks during face-to-face grooming where the visual aspect of the signal could be perceived. Data are consistent with the hypothesis that chimpanzee lip-smacks function to coordinate and prolong social grooming, suggesting that this oral signal is an example of a communicative behaviour facilitating cooperative behaviour in chimpanzees.

No MeSH data available.


The relationship between lip-smacking and whether or not the groomed part was a vulnerable body part (GLMM, ***P < 0.001; Random effects: Groomer ID, Groomee ID and Grooming bout ID).
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f3: The relationship between lip-smacking and whether or not the groomed part was a vulnerable body part (GLMM, ***P < 0.001; Random effects: Groomer ID, Groomee ID and Grooming bout ID).

Mentions: Lip-smacks were more likely to be produced if grooming vulnerable body parts, such as the head and ano-genital areas, than non-vulnerable body parts (Table 1, Fig. 3). Lip-smacks were also more likely to be given if groomers were in front of the groomees (54% of samples taken throughout grooming bouts contained lip-smacks) than when they were oriented in other ways (34% of samples contained lip-smacks; Table 1). Contrary to our predictions, however, males were not more likely to give lip-smacks when grooming PSPs or higher ranking individuals (Table 1).


Chimpanzee lip-smacking facilitates cooperative behaviour.

Fedurek P, Slocombe KE, Hartel JA, Zuberbühler K - Sci Rep (2015)

The relationship between lip-smacking and whether or not the groomed part was a vulnerable body part (GLMM, ***P < 0.001; Random effects: Groomer ID, Groomee ID and Grooming bout ID).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4544027&req=5

f3: The relationship between lip-smacking and whether or not the groomed part was a vulnerable body part (GLMM, ***P < 0.001; Random effects: Groomer ID, Groomee ID and Grooming bout ID).
Mentions: Lip-smacks were more likely to be produced if grooming vulnerable body parts, such as the head and ano-genital areas, than non-vulnerable body parts (Table 1, Fig. 3). Lip-smacks were also more likely to be given if groomers were in front of the groomees (54% of samples taken throughout grooming bouts contained lip-smacks) than when they were oriented in other ways (34% of samples contained lip-smacks; Table 1). Contrary to our predictions, however, males were not more likely to give lip-smacks when grooming PSPs or higher ranking individuals (Table 1).

Bottom Line: We found that lip-smacking, a distinct multimodal oral gesture produced during grooming, coordinated this activity.Lip-smacking at the beginning of grooming bouts was significantly more often followed by longer and reciprocated bouts than silent grooming initiations.Data are consistent with the hypothesis that chimpanzee lip-smacks function to coordinate and prolong social grooming, suggesting that this oral signal is an example of a communicative behaviour facilitating cooperative behaviour in chimpanzees.

View Article: PubMed Central - PubMed

Affiliation: Institute of Biology, University of Neuchâtel, Switzerland.

ABSTRACT
Signalling plays an important role in facilitating and maintaining affiliative or cooperative interactions in social animals. Social grooming in primates is an example of an interaction that requires coordination between partners but little is known about communicative behaviours facilitating this activity. In this study, we analysed the communication of wild chimpanzees of Budongo Forest, Uganda, as they entered and maintained a naturally occurring cooperative interaction: social grooming. We found that lip-smacking, a distinct multimodal oral gesture produced during grooming, coordinated this activity. Lip-smacking at the beginning of grooming bouts was significantly more often followed by longer and reciprocated bouts than silent grooming initiations. Lip-smacks were more likely to be produced when the risk of termination of the interaction by the recipient was high, for instance when grooming vulnerable body parts. Groomers were also more likely to produce lip-smacks during face-to-face grooming where the visual aspect of the signal could be perceived. Data are consistent with the hypothesis that chimpanzee lip-smacks function to coordinate and prolong social grooming, suggesting that this oral signal is an example of a communicative behaviour facilitating cooperative behaviour in chimpanzees.

No MeSH data available.